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Occurrence and Function of Natural Products in Plants – Michael Wink PHYTOCHEMISTRY AND PHARMACOGNOSY – Occurrence and Function of Natural Products in Plants – Michael Wink OCCURRENCE AND FUNCTION OF NATURAL PRODUCTS IN PLANTS Michael Wink Institute of Pharmacy and Molecular Biotechnology, Heidelberg University, INF 364, 69120 Heidelberg, Germany Keywords: Secondary metabolites, ecological functions, defense compounds, signal compounds, evolution, chemotaxonomy, pharmacology, toxicology, endophytic fungi, horizontal gene transfer, transport, storage Contents 1. Classes and Numbers of Secondary Metabolites (SM) 2. Occurrence and Properties of Major Groups of SM 3. Physiology of Secondary Metabolism: Biosynthesis, Transport and Storage of SM 4. Ecological Roles of SM 5. Molecular Modes of Action of SM 6. Chemosystematics of Plants and Distribution Patterns of SM 7. Origins and Evolution of Plant Secondary Metabolism 8. Conclusions Glossary Bibliography Biographical sketch Summary Secondary metabolites (SM) occur in plants in a high structural diversity. A typical feature of secondary metabolites is their storage as complex mixtures in relatively high concentrations, sometimes in organs which do not produce them. Some SM are stored as inactive “prodrugs” that are enzymatically activated in case of danger (wounding, infection). Biochemical and physiological features of secondary metabolism are strongly correlated with its function: SM are not useless waste products but important means of plants for defense against herbivores, microbes (bacteria, fungi) and viruses. Some SM also functions as signal molecules to attract pollinating arthropods or seed- dispersing animals. Land plants have evolved SM with a wide repertoire of biochemical and pharmacologicalUNESCO properties. Many –SM inEOLSSteract with proteins, DNA/RNA and/or biomembranes. Some of the interactions with molecular targets are highly specific, others have pleiotropicSAMPLE properties. All plants CHAPTERSproduce secondary metabolites. Whereas some SM have a taxonomically restricted distribution, very often the same SM also occurs in other plant groups which are not phylogenetically related. How to explain the patchy distribution? Theoretically, the occurrence of a SM in unrelated taxa may be due to convergent evolution. Alternatively, the genes encoding the enzymes of secondary metabolism might be widely distributed in the plant kingdom but switched on or off in a certain phylogenetic context. The analysis of nucleotide and amino acid sequences, provide evidence that most of the genes, which encode key enzymes of SM biosynthesis have indeed a wide distribution in the plant kingdom. It is speculated that these genes were introduced into the plant genome during early evolution by horizontal gene ©Encyclopedia of Life Support Systems (EOLSS) PHYTOCHEMISTRY AND PHARMACOGNOSY – Occurrence and Function of Natural Products in Plants – Michael Wink transfer, i.e. via bacteria that developed into mitochondria and chloroplasts. A patchy distribution can also be due to the presence of endophytic fungi, which are able to produce SM. The profile of plant secondary metabolites in a given plant is thus the result of a complex process that had evolved over the last 500 million years. 1. Classes and Numbers of Secondary Metabolites A typical characteristic of plants and other sessile organisms, which cannot run away when attacked by enemies or which do not have an immune system to ward off pathogens, is their capacity to synthesize an enormous variety of low molecular weight compounds, the so-called secondary metabolites (SM) or natural product. Type of secondary metabolite Approximate numbers* Nitrogen-containing SM Alkaloids 21000 Non-protein amino acids (NPAAs) 700 Amines 100 Cyanogenic glycosides 60 Glucosinolates 100 Alkamides 150 Lectins, peptides, polypeptides 2000 SM without nitrogen Monoterpenes including iridoids (C10) ** 2500 Sesquiterpenes C15)** 5000 Diterpenes (C20)** 2500 Triterpenes, steroids, saponins (C30, C27)** 5000 Tetraterpenes (C40)** 500 Flavonoids, tannins 5000 Phenylpropanoids, lignin, coumarins, lignans, 2000 Polyacetylenes, fatty acids, waxes 1500 Anthraquinones and other polyketides 750 Carbohydrates, organic acids 200 Table 1. Numbers of secondary metabolites reported from higher plants *approximateUNESCO number of known structures; – **t EOLSSotal number of terpenoids exceeds 22000 at present. More than 100SAMPLE 000 SM have been identified CHAPTERS by phytochemists, including many nitrogen-free (such as terpenes, saponins, polyketides, phenolics and polyacetylenes) and nitrogen-containing compounds (such as alkaloids, amines, cyanogenic glycosides, non-protein amino acids, glucosinolates, alkamides, peptides and lectins) (Table 1, Figure 1). All plants produce SM and usually store several major compounds, usually from different structural classes and biochemical pathways, which are commonly accompanied by dozens of minor components. It is typical to find complex mixtures, which differ from organ to organ, sometimes between individual plants and regularly between species. Within a single plant species 5000 to 20000 individual primary and ©Encyclopedia of Life Support Systems (EOLSS) PHYTOCHEMISTRY AND PHARMACOGNOSY – Occurrence and Function of Natural Products in Plants – Michael Wink secondary compounds may be produced, although most of them as trace amounts which usually are overlooked in a phytochemical analysis. Figure 1. Structures of selected secondary metabolites. 2. Occurrence and Properties of Major Groups of SM Alkaloids are widely distributed in the plant kingdom (especially angiosperms) and represent the largest group of SM that contain one or several nitrogen atoms either in a ring structureUNESCO (true alkaloids) or in a side – chain EOLSS (pseudoalkaloids). Chemically, alkaloids behave as a base; they are uncharged at alkaline pH (>11) and protonated under physiological conditions.SAMPLE The majority of alka CHAPTERSloids have been found to be derived from amino acids, such as tyrosine, phenylalanine, anthranilic acid, tryptophan/tryptamine, ornithine/arginine, lysine, histidine and nicotinic acid. However, alkaloids may be derived from other precursors such as purines in case of caffeine, terpenoids, which become “aminated” after the main skeleton has been synthesized, i.e. aconitine or the steroidal alkaloids, such as are found in the Solanaceae and Liliaceae. Alkaloids may also be formed from acetate-derived polyketides, where the amino nitrogen is introduced as in the hemlock alkaloid, coniine. Depending on the ring structures, alkaloids are subdivided into pyrrolidine, piperidine, pyrrolizidine, quinolizidine, isoquinoline, protoberberine, aporphine, morphinane, quinoline, acridone, indole, ©Encyclopedia of Life Support Systems (EOLSS) PHYTOCHEMISTRY AND PHARMACOGNOSY – Occurrence and Function of Natural Products in Plants – Michael Wink monoterpene indole, diterpene or steroid alkaloids. The biosynthetic pathways of the main groups of alkaloids have already been elucidated at the enzyme and gene level. Alkaloid are infamous as animal toxins and certainly serve mainly as defense chemicals against predators (herbivores, carnivores) and to a lesser degree against bacteria, fungi and viruses. Alkaloids and amines often affect neuroreceptors in animals as agonists or antagonists, or they modulate other steps in neuronal signal transduction, such as ion channels or enzymes, which take up or degrade neurotransmitters or second messengers. Since alkaloids often derive from the same amino acid precursor as the neurotransmitters acetylcholine, serotonin, noradrenaline, dopamine, gamma aminobutyric acid (GABA), glutamic acid or histamine, their structures can frequently be superimposed on those of neurotransmitters. They thus share functional pharmacological groups. Other alkaloids are mutagenic in that they intercalate DNA, alkylate DNA, induce apoptosis or inhibit carbohydrate processing enzymes. It is apparent that the toxicity of most alkaloids is correlated with their interactions with a particular molecular target. Non-protein amino acids (NPAAs) are abundant in seeds, leaves and roots of legumes (Fabaceae) and in some monocots (Alliaceae, Iridaceae, Hyacinthaceae), but also occur in Cucurbitaceae, Euphorbiaceaee, Resedaceae, Sapindaceae, and Cycadaceae. They can be considered as structural analogues to one of the 20 protein amino acids. NPAAs frequently block the uptake and transport of amino acids or disturb their biosynthetic feedback regulations. Some NPAAs are even incorporated into proteins, since transfer ribonucleic acid (tRNA) transferases cannot usually discriminate between a protein amino acid and its analogue; resulting in defective or malfunctioning proteins. Other NPAAs interfere with neuronal signal transduction or enzymatic processes. NPAAs often accumulate in seeds where they serve as herbivore repellent nitrogen storage molecules, which are recycled during growth of the seedling after germination. Cyanogenic glycosides have been recorded from more than 2000 plant species; they are especially abundant in Rosaceae, Fabaceae, Euphorbiaceae, Caprifoliaceae, Poaceae, Linaceae, Lamiaceae, Passifloraceae, Sapindaceae, Juncaginaceae and Ranunculaceae. Cyanogens are stored in the vacuole of seeds, leaves and roots as prefabricated allelochemicals (“prodrug” principle). If tissue decomposition occurs due to wounding by a herbivore or a pathogen, then a β-glucosidase comes into contact with the cyanogenic glucosides, which are split into a sugar and a nitrile moiety that is further hydrolyzed
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